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private void button1_Click(object sender, EventArgs e)
{
string str = this.textBox1.Text;
string str1 = "A";
string str2 = "B";
string a = str.Substring(0, 1);
string b = str.Substring(1, 1);
char[] c = b.ToCharArray();
if ((a.Equals(str1) || a.Equals(str2)) && (c[0] >= '0' && c[0] <= '9'))
{
textBox2.Text = "修改文件!";
}
else
{
if (!a.Equals(str1) && !a.Equals(str2))
{
textBox2.Text = "N";
}
if (!(c[0] >= '0' && c[0] <= '9'))
{
textBox2.Text = "M";
}
}
}